TWM620694U - Hinge - Google Patents

Abstract

This creation is about a hinge mechanism for a foldable electronic device. The foldable electronic device includes a first panel body and a second panel body that are relatively rotatable. The hinge mechanism includes a central main board, a first pivoting part and a second pivoting part. The central main board includes a first arc section and a second arc section. The first pivoting member is fixedly connected to the first panel body and clamps the first arc-shaped section. The second pivoting member is fixedly connected to the second panel body and clamps the second arc-shaped section. Wherein, the first pivoting member and the second pivoting member can be changed between a retracted position and an extended position, so that the first panel body and the second panel body can correspond to an unfolded state and a Switch between folded states.

Description

Hinge mechanism

This creation is about a hinge mechanism, especially a hinge mechanism for foldable electronic devices.

The Republic of China Patent No. I728801 discloses a rotating shaft module and a folding device using the rotating shaft module, which mainly include an arc-shaped base, a first rotating part, and a second rotating part. The arc-shaped base includes a The arc-shaped base and the cover are combined with a cover plate connected to the arc-shaped base. A first arc convex portion, a first upper rail, a second arc convex portion, and a second upper rail are mutually restricted, so that a first arc block of the first rotating member can be restricted to the arc-shaped seat body in an arc-shaped swing manner Only in a first arc-shaped guide portion of the second rotating member can a second arc-shaped block of the second rotating member be confined in a second arc-shaped guide portion of the arc-shaped seat body in an arc-shaped swing, so the structure is more complicated, and The cost cannot be effectively reduced.

This creation provides another hinge mechanism, which can omit the setting of the physical axis, and only needs to rely on the appearance and shape of the components of the hinge mechanism to complete the relative rotation between the two connected panels, so that the hinge mechanism can be more miniaturized, and then The connecting area between the two panels of the foldable electronic device can omit the shaft protruding from the housing, and the appearance consistency can be maintained even when the foldable electronic device is in the unfolded or folded state.

To achieve the above objective, the present invention discloses a hinge mechanism for a foldable electronic device. The foldable electronic device includes a central housing, a first panel body and a second panel pivotable relative to the central housing The main body, the hinge mechanism is accommodated in the central shell, and is connected with the first panel body and the second panel body. The hinge mechanism includes a central main board, a first pivoting part and a second pivoting part. The central main board is fixed on the central shell and includes a first arc section, a second arc section, a flat plate section, a first hollow groove and a second hollow groove. The first arc section has a first outer surface and a first inner surface opposite to the first outer surface. The second arc-shaped segment has a second outer surface and a second inner surface opposite to the second outer surface. The flat plate section is connected between the first arc section and the second arc section. The first hollow groove is formed in the flat plate section and the first arc-shaped section, and the second hollow groove is formed in the flat plate section and the second arc-shaped section. The first pivoting member is fixedly connected to the first panel body and includes at least one first arc arm and at least one first protrusion. The first arc arm has a first concave arc surface that slidably contacts the first outer surface, the first protrusion has a first convex arc surface that slidably contacts the first inner surface, the The first arc arm and the first protrusion jointly clamp the first arc section. The second pivoting member is fixedly connected to the second panel body and includes at least one second arc arm and at least one second protrusion. The second arc arm has a second concave arc surface that slidably contacts the second outer surface, the second protrusion has a second convex arc surface that slidably contacts the second inner surface, the The second arc arm and the second protrusion jointly clamp the second arc section. Wherein, the first pivoting member and the second pivoting member can be changed between a retracted position and an extended position, so that the first panel body and the second panel body can correspond to an unfolded state and a Switch between folded states.

The first pivoting member further includes at least one first sliding groove. The first arc arm and the first protrusion are arranged at corresponding intervals and jointly define the first sliding groove. When the first pivoting member When changing between the extended position and the retracted position, the first arc-shaped section slides relative to the first sliding groove; the second pivoting member further includes a second sliding groove, and the second arc The arm and the second protrusion are arranged at corresponding intervals and jointly define the second sliding groove. When the second pivoting member changes between the extended position and the retracted position, the second arc-shaped section Sliding in the second sliding groove.

The first hollow groove has a first wide groove area and a first narrow groove area connected to each other, the first wide groove area is formed in the flat plate section, and the first narrow groove area is formed in the first arc-shaped section, The first arc arm penetrates the first wide groove area and extends outward along the first outer surface. The second hollow groove has a second wide groove area and a second narrow groove area connected to each other. The second wide groove area is formed in the flat plate section, the second narrow groove area is formed in the second arc-shaped section, and the second arc arm penetrates the second wide groove area and faces outward along the second outer surface extend.

The first pivoting member further includes a first connecting plate connected to the first arc arm and the first protrusion and fixedly connected to the first panel body. The second pivoting member further includes a second The connecting plate connects the second arc arm and the second bump, and is fixedly connected with the second panel body.

The first arc-shaped section further has a first stopping surface, and the second arc-shaped section further has a second stopping surface. When the first pivoting member is at the extended position, the first connecting plate abuts Leaning against the first stopping surface, when the second pivoting member is located at the extended position, the second connecting plate abuts against the second stopping surface.

When the first pivoting member is in the retracted position, the first panel body and the first arc-shaped section abut against each other, and when the second pivoting member is in the retracted position, the second panel body Abut against the second arc-shaped section.

The first stop surface is angularly connected to the first outer surface and the first inner surface and adjacent to the first narrow groove area, and the second stop surface is angularly connected to the second outer surface and the second The inner surface is adjacent to the second narrow groove area.

The first arc-shaped section further has at least one first lobe, and the second arc-shaped section further has at least one second lobe. The first lobe is adjacent to the first wide groove area and the The first narrow groove area, the second lobe is adjacent to the second wide groove area and the second narrow groove area, when the first pivoting member and the second pivoting member are in the retracted position , The first protrusion and the first arc arm jointly clamp the first lobe portion, and the second protrusion and the second arc arm jointly clamp the second lobe portion.

The first connecting plate has at least one first notch, and the second connecting plate has at least one second notch. When the first pivoting member is transformed from the retracted position to the extended position, the first concave When the second pivoting member is changed from the retracted position to the extended position, the second notch allows the second convex corner to pass through.

The first pivoting member further includes a first opening communicating with the first sliding groove, and the second pivoting member further includes a second opening communicating with the second sliding groove.

The first connecting plate and the second connecting plate each have a positioning block for assembling with the first panel body and the second panel body respectively.

The first inner surface, the first outer surface, the first concave arc surface, and the first convex arc surface have substantially the same curvature, so that the first pivoting member can be centered on a first virtual axis relative to The central main board pivots; the second inner surface, the second outer surface, the second concave arc surface, and the second convex arc surface have substantially the same curvature, so that the second pivoting member can be a second The virtual axis is centered and pivots relative to the central main board.

The first virtual axis and the second virtual axis are parallel to each other and do not overlap.

The first pivoting member defines a first length, a first height, and a first width, the first wide slot area defines a first wide slot length and a first wide slot width, and the first narrow slot area defines A first narrow slot length, the first height is smaller than the first wide slot width, the first narrow slot length is smaller than the first width, the first width is smaller than the first wide slot length; the second pivoting member defines A second length, a second height and a second width, the second wide groove area defines a second wide groove length and a second wide groove width, the second narrow groove area defines a second narrow groove length, The second height is smaller than the second wide slot width, the second narrow slot length is smaller than the second width, and the second width is smaller than the second wide slot length.

The first arc section and the flat plate section jointly define a first orthographic projection plate length, the first orthographic projection plate length is smaller than the first length; the second arc section and the flat plate section jointly define a second orthographic projection The board length, the second orthographic projection board length is smaller than the second length.

Figures 1 and 2 show an embodiment of the creative hinge mechanism 1000. The hinge mechanism 1000 is used in a foldable electronic device 2000 (that is, a folding mobile phone is taken as an example). As shown in FIGS. 3 to 5, the foldable electronic device 2000 includes a central housing 2100 that can pivot relative to the central housing 2100 A first panel body 2200 and a second panel body 2300. The hinge mechanism 1000 is accommodated in the central housing 2100 and is connected to the first panel body 2200 and the second panel body 2300. As shown in FIG. 5, the number of hinge mechanisms 1000 is two, but it is not limited thereto. The hinge mechanism 1000 includes a central main board 1, a first pivoting member 2 and a second pivoting member 3. The central main board 1 is fixed to the central housing 2100, the first pivoting member 2 is fixed to the first panel body 2200, and the second pivoting member 3 is fixed to the second panel body 2300.

Please refer to Figures 6 and 7 together. Figures 6 and 7 are schematic diagrams of the outer and inner sides of the central main board 1, respectively. The central main board 1 includes a first arc section 11, a second arc section 12, and a flat plate section. 13. A first hollow groove 14, a second hollow groove 15, and two mounting holes 16. The flat plate section 13 is connected between the first arc section 11 and the second arc section 12. The first hollow groove 14 is formed in the flat plate section 13 and the first arc-shaped section 11, and the second hollow groove 15 is formed in the flat plate section 13 and the second arc-shaped section 12. The first arc section 11 has a first outer surface 111, a first inner surface 112, a first stop surface 113 and two first convex corners 114. The first inner surface 112 is formed opposite to the first outer surface 111. The first stop surface 113 is angularly connected to the first outer surface 111 and the first inner surface 112. The second arc section 12 has a second outer surface 121, a second inner surface 122, a second stop surface 123 and two second convex corners 124. The second inner surface 122 is formed opposite to the second outer surface 121. The second stop surface 123 is angularly connected to the second outer surface 121 and the second inner surface 122.

The first hollow groove 14 has a first wide groove area 141 and a first narrow groove area 142 connected to each other. The first wide groove area 141 is formed on the flat plate section 13, and the first narrow groove area 142 is formed on the first arc section 11. Both are approximately rectangular as an example, but not limited to this. Among them, the first stopper The surface 113 is adjacent to the first narrow groove area 142, and the first convex corner portion 114 is adjacent to the first wide groove area 141 and the first narrow groove area 142. The second hollow groove 15 has a second wide groove area 151 and a second narrow groove area 152 connected to each other. The second wide groove area 151 is formed in the flat plate section 13, and the second narrow groove area 152 is formed in the second arc section. 12. Also take the approximately rectangular shape as an example, where the second stop surface 123 is adjacent to the second narrow groove area 152, and the second convex corner portion 124 is adjacent to the second wide groove area 151 and the second narrow groove area 151.槽区152. In addition, the mounting hole 16 is formed in the flat plate section 13, and the central main board 1 can be fixed to the central housing 2100 by correspondingly piercing screws or tenons (not shown in the figure).

2 and 8 to 10, the first pivoting member 2 includes two first arc arms 21, two first protrusions 22, two first sliding grooves 23, a first connecting plate 24 and a first opening 25. One end of the first arc arm 21 is spaced apart on both sides of the first connecting plate 24, and extends from a head end of the first connecting plate 24 to a tail end, but the first arc arm 21 The other end is not connected to the tail end of the first connecting plate 24, thereby forming the first opening 25; An arc arm 21 corresponds to each other at intervals and collectively defines the first sliding groove 23, and the first opening 25 communicates with the first sliding groove 23. Since the two first arc arms 21, the two first protrusions 22, and the two first sliding grooves 23 can form two symmetrical and identical structures, one of them will be taken as an example in the following description. The communicating first opening 25 and the first sliding groove 23 can allow the first arc section 11 to pass through, so the first arc arm 21 can penetrate through the first wide groove area 141 and extend outward along the first outer surface 111. An arc arm 21 has a first concave arc surface 211 that slidably contacts the first outer surface 111, and the first protrusion 22 has a first convex arc surface 221 that slidably contacts the first inner surface 112, and the first arc The arm 21 and the first protrusion 22 jointly clamp the first arc section 11. The first inner surface 112, the first outer surface 111, the first concave arc surface 211, and the first convex arc surface 221 have substantially the same curvature. Therefore, the first pivoting member 2 can be centered on a first virtual axis X1 It pivots relative to the central main board 1. The first sliding groove 23 is provided for the first arc-shaped section 11 to slide relative to each other, so that the first pivoting member 2 is assembled with the central main board 1. The first connecting plate 24 has two first notches 241 and a positioning block 242, and the first notches 241 are respectively provided corresponding to the first convex corners 114 for the first convex corners 114 to pass through. The positioning block 242 is used for assembling with a groove (not shown in the figure) on an extension plate 2201 of the first panel body 2200. The number of the first arc arm 21, the first protrusion 22, and the first recess 241 is not limited, and only needs to be set corresponding to each other.

Similarly, the second pivoting member 3 includes two second arc arms 31, two second protrusions 32, two second sliding grooves 33, a second connecting plate 34 and a second opening 35. One ends of the second arc arm 31 are spaced apart on both sides of the second connecting plate 34, and are bent and extended from a head end of the second connecting plate 34 toward a tail end, but the second arc arm 31 The other end is not connected to the tail end of the second connecting plate 34, thereby forming the second opening 35; the second bumps 32 are arranged at the center of both sides of the second connecting plate 34 at intervals, and are respectively connected to the first The two arc arms 31 correspond to each other at intervals and jointly define the second sliding groove 33, and the second opening 35 communicates with the second sliding groove 33. Since the two second arc arms 31, the two second protrusions 32, and the two second sliding grooves 33 can form two sets of symmetrical identical structures, one set of them will be taken as an example below. The connected second opening 35 and the second sliding groove 33 can allow the second arc section 12 to pass through. Therefore, the second arc arm 31 penetrates the second wide groove area 151 and extends outward along the second outer surface 121. The arc arm 31 has a second concave arc surface 311 that slidably contacts the second outer surface 121, and the second protrusion 32 has a second convex arc surface 321 that slidably contacts the second inner surface 122, and the second arc arm 31 and the second protrusion 32 jointly clamp the second arc section 12. Among them, the second inner surface 122, the second outer surface 121, the second concave arc surface 311, and the second convex arc surface 321 have substantially the same curvature. Therefore, the second pivoting member 3 can be centered on a second virtual axis X2 Relative to the central main board 1 pivoting, the first virtual axis X1 and the second virtual axis X2 are parallel to each other and do not overlap. The second sliding groove 33 is provided for the second arc-shaped section 12 to slide relative to each other, so that the second pivoting member 3 is assembled with the central main board 1. The second connecting plate 34 has two second notches 341 and a positioning block 342. The second notches 341 are respectively provided corresponding to the second convex corners 124 for the second convex corners 124 to pass through. The positioning block 342 is used to assemble with a groove (not shown in the figure) on an extension plate 2301 of the second panel body 2300. The number of the second arc arms 31, the second protrusions 32 and the second recesses 341 is not limited, as long as the numbers are set corresponding to each other.

The operation method of the creative hinge mechanism 1000 will be described below. The first pivoting member 2 and the second pivoting member 3 can be changed between a retracted position (as shown in FIG. 9) and an extended position (as shown in FIG. 10), so that the first panel body 2200 and the second The two-panel body 2300 corresponds to switching between an unfolded state (as shown in FIG. 3) and a folded state (as shown in FIG. 4). In other words, when the first pivoting member 2 and the second pivoting member 3 are in the retracted position, the first panel body 2200 and the second panel body 2300 correspond to the expanded state; when the first pivoting member 2 and the second pivoting member 2 When the two pivoting members 3 are in the extended position, the first panel body 2200 and the second panel body 2300 correspond to the folded state.

Referring to Figure 9, when the first pivoting member 2 is in the retracted position, the first panel body 2200 and the first arc-shaped section 11 abut against each other, and the first protrusion 22 and the first arc arm 21 are common The first convex corner portion 114 is clamped. When the second pivoting member 3 is in the retracted position, the second panel body 2300 and the second arc-shaped section 12 abut against each other, and the second protrusion 32 and the second arc arm 31 jointly clamp the The second lobe 124.

When the first pivoting member 2 changes from the retracted position to the extended position, the first arc-shaped section 11 slides relative to the first sliding groove 23, and the first convex corners 114 will pass through the corresponding For the first notch 241, when the second pivoting member 3 is transformed from the retracted position to the extended position, the second arc-shaped section 12 slides relative to the second sliding groove 33, and the second lobe The parts 124 respectively pass through the second notches 341 respectively.

10, when the first pivoting member 2 is in the extended position, the first connecting plate 24 abuts against the first stop surface 113, when the second pivoting member 3 is in the extended position, the second connecting plate 34 abuts against the second stop surface 123.

When the first pivoting member 2 changes from the extended position to the retracted position, the first arc-shaped section 11 also slides relative to the first sliding groove 23, and when the second pivoting member 3 changes from the extended position When reaching the retracted position, the second arc-shaped section 12 also slides relative to the second sliding groove 33.

It should be noted that the main function of the first lobe 114 and the second lobe 124 is to increase the length of the first arc section 11 clamped between the first arc arm 21 and the first protrusion 22 and The length of the second arc section 12 clamped between the second arc arm 31 and the second protrusion 32 increases the stability of the connection between the first pivoting member 2 and the second pivoting member 3 and the central main board 1. The first notch 241 and the second notch 341 are arranged to increase the rotation range of the first pivoting member 2 and the second pivoting member 3, so that the first pivoting member 2 and the second pivoting member 3 are rotated. When reaching the extended position, the first connecting plate 24 and the second connecting plate 34 will not interfere with the first convex corner portion 114 and the second convex corner portion 124.

Next, the size matching relationship between the central main board 1, the first pivoting member 2 and the second pivoting member 3 will be further described to illustrate how to meet the installation requirements. Please refer to FIG. 11 again. In detail, the first pivoting member 2 defines a first length A1, a first height A2, and a first width A3, and the first wide slot area 141 defines a first wide slot length B1 and A first wide groove width B2, a first narrow groove area 142 defines a first narrow groove length C1. The second pivoting member 3 defines a second length D1, a second height D2, and a second width D3. The second wide slot area 151 defines a second wide slot length E1 and a second wide slot width E2. The two narrow groove regions 152 define a second narrow groove length F1. Among them, the first length A1, the first height A2, the first width A3, the first wide groove length B1, the first wide groove width B2, and the first narrow groove length C1 are respectively related to the second length D1, the second height D2, and the first narrow groove length. The two widths D3, the second wide groove length E1, the second wide groove width E2, and the second narrow groove length F1 are the same.

In addition, the first arc section 11 and the flat plate section 13 jointly define a first orthographic projection plate length L1, and the first orthographic projection plate length L1 is smaller than the first length A1; the second arc section 12 and the flat plate section 13 jointly define a first orthographic projection plate length L1. The length of the second orthographic projection board is L2, and the length of the second orthographic projection board L2 is smaller than the second length D1.

In the first pivoting member 2 and the first hollow slot 14, the first height A2 is smaller than the first wide slot width B2, and the first width A3 is smaller than the first wide slot length B1, so that the first pivoting member 2 can It penetrates through the first wide groove area 141 during initial installation. In addition, the first narrow groove length C1 is smaller than the first width A3, so the first convex corner 114 of the first arc section 11 is clamped by the first arc arm 21 and the first protrusion 22 to increase the first arc section 11 is the length in the first sliding groove 23. Similarly, in the second pivoting member 3 and the second hollow slot 15, the second height D2 is smaller than the second wide slot width E2, and the second width D3 is smaller than the second wide slot length E1, so that the second pivoting member 3 It can pass through the second wide slot area 151 during initial installation. In addition, the second narrow groove length F1 is smaller than the second width D3, so the second convex corner portion 124 of the second arc section 12 is clamped by the second arc arm 31 and the second protrusion 32 to increase the second arc section 12 is the length in the second sliding groove 33.

In summary, the first and second sliding grooves have the same curvature as the first and second arc-shaped sections, respectively, and the first and second pivoting elements and the central main board only depend on the appearance. The shape fits and can move with each other in a limited position. At the same time, the first panel body and the second panel body do not need to be provided with a solid axis and shaft hole, and they can be rotated relative to each other to switch between the folded and unfolded states. Therefore, this creation The hinge mechanism can be more miniaturized, thereby reducing costs.

The above-mentioned embodiments are only used to exemplify the implementation of this creation and explain the technical features of this creation, and are not used to limit the protection scope of this creation. Any changes or equal arrangements that can be easily completed by those familiar with this technology belong to the scope of this creation, and the scope of protection of the rights of this creation shall be subject to the scope of the patent application.

1000: Hinge mechanism 2000: Folding electronic device 2100: Central shell 2200: The first panel body 2201: Extension plate 2300: The second panel body 2301: Extension plate 1: Central motherboard 11: The first arc segment 111: first outer surface 112: first inner surface 113: The first stop surface 114: first convex corner 12: The second arc segment 121: second outer surface 122: second inner surface 123: The second stop surface 124: Second convex corner 13: flat section 14: The first hollow slot 141: The first wide slot area 142: The first narrow slot area 15: The second hollow slot 151: second wide slot area 152: The second narrow slot area 16: installation hole 2: The first pivot 21: First arc arm 211: The first concave arc 22: The first bump 221: The first convex arc 23: The first sliding groove 24: The first connection board 241: The first notch 242: positioning block 25: first opening 3: The second pivot 31: second arc arm 311: second concave arc 32: second bump 321: second convex arc 33: second sliding groove 34: The second connecting plate 341: second notch 342: positioning block 35: second opening X1: the first virtual axis X2: The second virtual axis A1: The first length A2: First height A3: The first width B1: The first wide slot length B2: The first wide slot width C1: The first narrow groove length L1: The length of the first orthographic projection board D1: second length D2: second height D3: second width E1: The second widest slot length E2: The second widest groove width F1: The second narrow groove length L2: The second front projection board length

Figure 1 is a perspective view of an embodiment of a creative hinge mechanism; Figure 2 is an exploded view of an embodiment of the creative hinge mechanism; Figure 3 is a schematic diagram of the creative hinge mechanism applied to the foldable electronic device in the unfolded state; Figure 4 is the intention of the creative hinge mechanism applied to the foldable electronic device in the folded state; Figure 5 is a schematic diagram of the creative hinge mechanism installed on the foldable electronic device; Figure 6 is a schematic diagram of the central main board of the creative hinge mechanism; Figure 7 is another schematic diagram of the central main board of the creative hinge mechanism; Figure 8 is a schematic diagram of the first pivoting member and the second pivoting member of the creative hinge mechanism; Figure 9 is a schematic diagram of the retracted position of the creative hinge mechanism; Figure 10 is a schematic diagram of the creative hinge mechanism in the extended position; and Figure 11 is a schematic diagram of the size of the creative hinge mechanism.

1000: Hinge mechanism

1: Central motherboard

11: The first arc segment

12: The second arc segment

13: flat section

16: installation hole

2: The first pivot

3: The second pivot

Claims (15)

A hinge mechanism for a foldable electronic device. The foldable electronic device includes a central housing, a first panel body and a second panel body that can pivot relative to the central housing, and the hinge mechanism is accommodated in The central shell is connected with the first panel body and the second panel body, and the hinge mechanism includes: A central main board, fixed on the central housing, and containing: A first arc-shaped section having a first outer surface and a first inner surface opposite to the first outer surface; A second arc-shaped segment having a second outer surface and a second inner surface opposite to the second outer surface; A flat plate section connected between the first arc section and the second arc section; A first hollow groove formed in the flat section and the first arc section; and A second hollow groove formed in the flat section and the second arc section; A first pivoting member is fixedly connected to the first panel body and includes at least one first arc arm and at least one first protrusion. The first arc arm has a first concave arc surface and slidably contacts On the first outer surface, the first convex block has a first convex arc surface, which slidably contacts the first inner surface, and the first arc arm and the first convex block jointly clamp the first arc Shape segment; and A second pivoting member is fixedly connected to the second panel body and includes at least one second arc arm and at least one second protrusion. The second arc arm has a second concave arc surface and slidably contacts The second outer surface, the second convex block has a second convex arc surface, which slidably contacts the second inner surface, and the second arc arm and the second convex block jointly clamp the second arc Shape segment Wherein, the first pivoting member and the second pivoting member can be changed between a retracted position and an extended position, so that the first panel body and the second panel body can correspond to an unfolded state and a Switch between folded states. The hinge mechanism according to claim 1, wherein the first pivoting member further includes at least one first sliding groove, and the first arc arm and the first protrusion are arranged at corresponding intervals and jointly define the The first sliding groove, when the first pivoting member changes between the extended position and the retracted position, the first arc-shaped section slides relative to the first sliding groove; the second pivoting member is more It includes a second sliding groove. The second arc arm and the second protrusion are arranged at corresponding intervals and jointly define the second sliding groove. When the second pivoting member is at the extended position and the retracted position When the positions are changed, the second arc-shaped segment slides relative to the second sliding groove. The hinge mechanism according to claim 2, wherein the first hollow groove has a first wide groove area and a first narrow groove area connected to each other, the first wide groove area is formed on the plate section, and the first A narrow groove area is formed in the first arc section, the first arc arm penetrates the first wide groove area and extends outward along the first outer surface, and the second hollow groove has a second hollow groove connected to each other. A wide groove area and a second narrow groove area, the second wide groove area is formed in the flat plate section, the second narrow groove area is formed in the second arc section, and the second arc arm penetrates the second arc section. The wide groove area extends outward along the second outer surface. The hinge mechanism according to claim 3, wherein the first pivoting member further includes a first connecting plate, which connects the first arc arm and the first protrusion, and is fixedly connected to the first panel body The second pivoting member further includes a second connecting plate, which connects the second arc arm and the second protrusion, and is fixedly connected to the second panel body. The hinge mechanism according to claim 4, wherein the first arc-shaped section further has a first stopping surface, and the second arc-shaped section further has a second stopping surface, when the first pivoting member is located In the extended position, the first connecting plate abuts against the first stop surface, and when the second pivoting member is in the extended position, the second connecting plate abuts against the second stop surface. The hinge mechanism according to claim 5, wherein when the first pivoting member is in the retracted position, the first panel body and the first arc-shaped section abut against each other, and when the second pivoting member is When in the retracted position, the second panel body and the second arc-shaped section abut against each other. The hinge mechanism according to claim 6, wherein the first stop surface is angularly connected to the first outer surface and the first inner surface, and is adjacent to the first narrow groove area, and the second stop surface is angularly The ground is connected to the second outer surface and the second inner surface, and is adjacent to the second narrow groove area. The hinge mechanism according to claim 7, wherein the first arc-shaped section further has at least one first lobe, and the second arc-shaped section further has at least one second lobe, the first lobe Portion is adjacent to the first wide groove area and the first narrow groove area, the second convex corner portion is adjacent to the second wide groove area and the second narrow groove area, when the first pivoting member and When the second pivoting member is in the retracted position, the first protrusion and the first arc arm jointly clamp the first lobe, the second protrusion and the second arc arm Clamp the second convex corner together. The hinge mechanism according to claim 8, wherein the first connecting plate has at least one first notch, and the second connecting plate has at least one second notch, when the first pivoting member is moved from the retracted position To the extended position, the first notch is for the first lobe to pass through, and when the second pivoting member is changed from the retracted position to the extended position, the second notch is for the first lobe to pass through. Two convex corners pass. The hinge mechanism according to claim 9, wherein the first pivoting member further includes a first opening connected to the first sliding groove, and the second pivoting member further includes a second opening connected to the second The sliding grooves are connected. The hinge mechanism according to claim 10, wherein each of the first connecting plate and the second connecting plate further has a positioning block for assembling with the first panel body and the second panel body respectively. The hinge mechanism according to claims 1 to 11, wherein the first inner surface, the first outer surface, the first concave arc surface, and the first convex arc surface have substantially the same curvature, so that the first A pivoting member can pivot relative to the central main board with a first virtual axis as the center; the second inner surface, the second outer surface, the second concave arc surface, and the second convex arc surface are substantially the same The curvature of the second pivoting member can pivot relative to the central main board with a second virtual axis as the center. The hinge mechanism according to claim 12, wherein the first virtual axis and the second virtual axis are parallel to each other and do not overlap. The hinge mechanism according to claim 13, wherein the first pivoting member defines a first length, a first height, and a first width, and the first wide slot area defines a first wide slot length and a first width. A wide groove width, the first narrow groove area defines a first narrow groove length, the first height is smaller than the first wide groove width, the first narrow groove length is smaller than the first width, the first width is smaller than the first width A wide slot length; the second pivoting member defines a second length, a second height and a second width, the second wide slot area defines a second wide slot length and a second wide slot width, the first The two narrow groove regions define a second narrow groove length, the second height is smaller than the second wide groove width, the second narrow groove length is smaller than the second width, and the second width is smaller than the second wide groove length. The hinge mechanism according to claim 14, wherein the first arc section and the flat plate section jointly define a first orthographic projection plate length, the first orthographic projection plate length is smaller than the first length; the second arc shape The section and the flat plate section jointly define a second orthographic projection board length, and the second orthographic projection board length is smaller than the second length.

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